Class: GeoTriangleExt::LinearFunction

Inherits:
Object
  • Object
show all
Defined in:
lib/geo_triangle_ext/linear_function.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#ax ⇒ Object 



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# File 'lib/geo_triangle_ext/linear_function.rb', line 21

def ax
  @bax ||= BigDecimal(@ax.to_s)
  @bax

end

#ay ⇒ Object 



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# File 'lib/geo_triangle_ext/linear_function.rb', line 27

def ay
  @bay ||= BigDecimal(@ay.to_s)
  @bay
end

#bx ⇒ Object 



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# File 'lib/geo_triangle_ext/linear_function.rb', line 32

def bx
  @bbx ||= BigDecimal(@bx.to_s)
  @bbx
end

#by ⇒ Object 



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# File 'lib/geo_triangle_ext/linear_function.rb', line 37

def by
  @bby ||= BigDecimal(@by.to_s)
  @bby
end

Class Method Details

.create(ax, ay, bx, by) ⇒ Object 



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# File 'lib/geo_triangle_ext/linear_function.rb', line 10

def create(ax, ay, bx, by)
  lf = self.new
  lf.ax = ax
  lf.ay = ay
  lf.bx = bx
  lf.by = by
  lf
end

Instance Method Details

#intercept ⇒ Object 



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# File 'lib/geo_triangle_ext/linear_function.rb', line 59

def intercept
  return unless valid?
  (ax * by - ay * bx) / (ax - bx)
end

#middle_point ⇒ Object 



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# File 'lib/geo_triangle_ext/linear_function.rb', line 48

def middle_point
  x = (ax + bx) / 2.0
  y = (ay + by) / 2.0
  [x, y]
end

#orthogonal_intercept ⇒ Object 



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# File 'lib/geo_triangle_ext/linear_function.rb', line 69

def orthogonal_intercept
  return unless valid?
  (ax*ax + ay*ay - bx*bx - by*by) / (2 * (ay - by))
end

#orthogonal_slope ⇒ Object 



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# File 'lib/geo_triangle_ext/linear_function.rb', line 64

def orthogonal_slope
  return unless valid?
  (bx - ax) / (ay - by)
end

#slope ⇒ Object 



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# File 'lib/geo_triangle_ext/linear_function.rb', line 54

def slope
  return unless valid?
  (ay - by) / (ax - bx)
end

#valid? ⇒ Boolean 



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# File 'lib/geo_triangle_ext/linear_function.rb', line 42

def valid?
  return false if ax == bx
  return false if ay == by
  true
end